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A Shardblade is a magical weapon, created by unknown means, presumably by the Almighty, for use of the Knights Radiant. They are currently used by various factions and persons across Roshar. There are an estimated twenty Shardblades held by Alethkar, another twenty for Jah Keved, and maybe another forty spread out among the rest of Roshar.

Shardblades are unbreakable, can cut through stone with ease, and cut through a creature's soul rather than its flesh; though once the creature is killed the flesh is cut instead of the soul which has been severed. They are summoned by their holder over the course of ten heartbeats. When the holder (or Shardbearer) is killed, the Shardblade remains corporeal and may be claimed by another; if the Blade is dropped when the Shardbearer is still alive, the Shardblade will vanish.

When a Shardblade is summoned, (which includes a proses of waiting ten hart beats, which the Shardbearer can hear no matter how loud his surroundings) it is formed from mist, and is wet from dew. They are usually much longer than than an average blade, with a notable exception being Szeth's Shardblade.

Possibly related to the Dawnblades held by the ten Heralds.

Persons currently known to hold a Shardblade:

• King Elhokar - Shardblade called Sunraiser.
• Highprince Sadeas - Shardblade called Oathbringer. Traded by Dalinar for the lives of the bridgemen.
• Brightlord Adolin
• Shallan Davar
• Brightlord Amaram
• Szeth
• An unidentified Parshendi Shardbearer